package cn.ldh.oneway_01;

import org.apache.rocketmq.client.consumer.DefaultMQPushConsumer;
import org.apache.rocketmq.client.consumer.listener.ConsumeConcurrentlyContext;
import org.apache.rocketmq.client.consumer.listener.ConsumeConcurrentlyStatus;
import org.apache.rocketmq.client.consumer.listener.MessageListenerConcurrently;
import org.apache.rocketmq.common.message.MessageExt;

import java.nio.charset.StandardCharsets;
import java.util.List;

public class Consumer {

    public static void main(String[] args) throws Exception {
        // 1 创建消费者对象
        DefaultMQPushConsumer consumer = new DefaultMQPushConsumer("oneway_consumer_hello");

        // 2 设置地址
        consumer.setNamesrvAddr("localhost:9876");

        // 3 订阅
        consumer.subscribe("oneway_topic","hello");

        // 4 注册消息监听
        consumer.registerMessageListener(new MessageListenerConcurrently() {
            @Override
            public ConsumeConcurrentlyStatus consumeMessage(List<MessageExt> list, ConsumeConcurrentlyContext consumeConcurrentlyContext) {

                for (MessageExt messageExt : list) {
                    System.out.println(new String(messageExt.getBody(),StandardCharsets.UTF_8));
                }


                // 标识为成功
                return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
            }
        });

        // 5 启动
        consumer.start();
    }


}
